Can we export all content stored in Storyblok in just 1 go?
The S3 backups included in the Teams plan back up the whole space
Customers on Community or Entry have to utilize other ways to make the same thing happen.
Here are a few tools that may help you achieve what you're after.
Our CLI provides the option to export the component schema
Markus Oberlehner (an ambassador of ours) provides a set of scripts to backup components and stories. Check it out here
For assets, we have a corresponding script too